Brake mechanism.



J. R. MoGIFPERT.

BRAKE MEOHANISM.

APPLIOATIOI FILED OUT. 86, 1010.

Patented May 14,1912.

MT/VIJJAS y UNITED STATES PATENT; OFFICE."

DULUTH MINNESOTA, A. CORPORATION OF MINNESOTA.

BRAKE MECHANISM.-

Specification of Letters Patent.

Applicationflled October 1910. Serial No. 589,218.

To all whom it may concern Be it known that I, JOHN R. MoGirr'nn r, acitizen of the United States, anda residentof Duluth, county of St.Louis, and State of Minnesota, have invented a new anduseful-Improvement in Brake Mechanism, of which the following is aspecification, the principle of the invention being herein explained andthe best mode in which I have contemplated applying that principle,

,so as to distmguish it from other inventions.

- In-certain machines, such as hoisting and excavating machines, it 'isnecessary to provide very powerful brakes inorder to safely handle theload in its different positions. In the operation of such brakes, aserious diificulty arises in that an immense amount of heat is generatedby friction brakes of capacity adequate for the service demanded so thatwith constructions, such as are found in prevailing forms of hoistingmechanism, the machine can only be operated for a short time withoutstopping in order to .cool off the drum and the brake-mechanism.

The general ob'ect of this invention is to overcome the di cultymentioned. v

t The annexed drawings and the following at 10 and bears a drum 7provided with afsuitable braking surface. Such surface, it

willbe understood is'covered with suitable friction material, preferablyasbestds frice tion beard 40 (see Fi 5), which is riveted to the metalface of t e drum proper. En circling such surface is the brake-band 41shown in detail in the same" Fig. 5, just re-- fefred' to; This bandpreferably consists of a' steel strap securely attached at its one endto a portion of the engine frame 1 and at the other-to .an ordinarybrake rocker 42 which may be operated in the usual fashion either from ahand or foot leve (not shown). On the oytsideof the ban 41, I attach athin, pressed plate 43 of the cross section form clearly appearing inFig 2, the practical mode of such attachment be- Patented May i4, 1912.

JOHN R. McG-IFFERT, OF DULUTH, MINNESOTA, ASSIGNOR TO CLYDE TRON WORKS,OF'

ing to rivet said late to the main band alon its lower e ges, strips ofasbestos packing 44 being inserted between the plate and the band inorder to (make the pint water-tight. An annular chamber is thus formedon the outer face of the'band, its

walls by virtue of the construction just described being suflicientlyflexible to enable slight movement involved in ,the alternatecontraction and expansion of the band. At the two lower extremities ofthe chamber thus formed, hose connections are provided to which areattached the ends of two sections 45 of hose, 'or like flexible supplyconduits, that are conveniently joined mto-one common supply pipe 46 ata proper distance from the connections in question. Another similar hoseconnection is provided in the center of the chamber, or in. other words,

at its highest part to which a similar flexible conduit 47 is attached;This latter conduit extends to the top of the water-tank from which thewater 1s drawn for the boiler of the engine, while the lower hoseconnection is run to the lower part of such tank. By

this means, cold water may be circulated" -through the, chamber upon theband, coming'in at the bottom at each end thereof and passing oflthrough, the hose that leads from lts uppermost'point. In this way theband is cooled so as to avoid the excessive heating effects to whichreference as been previously made.

Ordinarily the heat that will be developed frictionally from thenecessary application of the bra e band will heat the water suflicientlyto cause a proper circulation thereof, although-a small pump in eitherthe sup 1y or discharge line from the chamber attac ed to. said band,may be utilized and the circulation thus madepositiv'e. Incidentally itwill be observed that this device, while it '05 ,such chamber toaccommodate itself to the serves as a'cool'ing means forthe brake bandalso serves as a hot water heater for the boiler; for as stated, thetank from which.

the water is drawn for the cooling ofthe band, and to which it isthereupon returned,

also serves to feed. said boiler. -Theheat' developed and thusconserv'edin the operation of a machlne of any considerableisize 'isvery large in amount, and the heating of the feed water thus secured, avery efi'ective 11.

element in the economical running of the same: I should further remarkthat-by usthe same.

- band; and means fore-circulating a'. cooling Other modes of applyingthe principle of my invention may be employed instead of the oneexplained; change being made as regards the, mechanism herein disclosed,provided the means stated by any of the fol lowing claims or theequivalent of such stated means be employed; I g

I therefore particularly point out and dis tinctl'y claim as myinvention 1. In mechanism of the class described, the

v combination a drum; a flexible brake band therefor; means forflexingsaid. band; a chamber substantially co-extensive with the bandprovided-.0 1 the outer faceof said fluid through said" chamber. 1 Y

' 2. In mechanism' of the class described,

a bifurcatedconnection for supplying Waterto such chamber at itsrespectiveends; and.

the combination of a drum; a flexible brake.

band therefor; said band having its two ends directed downwardly; meansfor flexing said band; a chamber, substantiallyco-extensive with saidband, provided on its outer'face;

another connection for withdrawing water from approximately the highestpart of said chamber.

f 3. In mechanism of the class described, the combination of a drum; aflexible brakeband therefor; means for flexing said band; \a chambersubstantially coextensive with the band provided on the outer face ofsaid band; heat insulating material disposed on the surface of said drumdesigned for the application of said band; and means for circulating acooling fluid through said chamber. v

4:. In mechanism of the class described,

the combination of a drum; a flexible band therefor, said band havingits two ends di- .;rected downwardly; means for flexing said band; :achamber substantially co-exten's'ive with said band, provided. on itsouter face; a bifurcated connection for supplying water to such chamberat its respective ends; another connection for withdrawing -Water fromapproximately the highest part of said chamber; and heat insulatingmaterial disposed on the surface of said drum' designed for theapplication of said band.

' Signed by me this 18th day of October, 1910.

Y J OHN-R 5 MCGIFFERT. Attested by' .ANNA L. -GI'LL,

Jnoi 'F. QBERLI-N.

